GRAS 40BD-FV 1/4" Prepolarized Pressure Microphone, Front Vented

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1 GRAS 40BD-FV 1/4" Prepolarized Pressure Microphone, Front Vented Freq range: 4 Hz to 70 khz Dyn range: 44 db(a) to 174 db Sensitivity: 1.6 mv/pa The 40BD-FV is an IEC WS3P ¼" prepolarized pressure microphone with front venting. It is a highprecision condenser microphone made according to IEC requirements. Its low sensitivity makes it ideal for sound measurements at high sound pressure levels of up to 166 db. Its small size reduces the effects of diffraction and reflections around the microphone, resulting in a frequency range that extends up to 70 khz. GRAS Sound & Vibration A/S Skovlytoften 33, 2840 Holte, Denmark

2 Technology Page: 2 Introduction Quality and warranty The 40BD-FV is an IEC WS3P ¼" prepolarized pressure microphone with front venting. Read about the externally polarized equivalent [ GRAS 40BP-FV] It is a high-precision condenser microphone made according to IEC requirements. Its low sensitivity makes it ideal for sound measurements at high frequencies and high sound pressure levels of up to 174 db. Its small size reduces the effects of diffraction and reflections around the microphone, resulting in a frequency range that extends up to 70 khz. 40BD-FV is individually factory-calibrated and delivered with a calibration chart stating its specific open-circuit sensitivity and pressure frequency response. Typical applications and use The 40BD-FV is ideal for sound pressure measurements, as well as high frequency and high level pressure measurements. It is suitable for general purpose acoustic measurements in couplers and at boundaries. 40BD-FV is included in the GRAS 46BD-FV ¼" Pressure microphone set. Compatibility The 40BD-FV requires a standardized ½" or ¼" CCP preamplifier and an input module that supports this technology with a BNC, SMB, or Microdot connector. System verification For daily verification and check of your measurement setup, we recommend using a calibrator like GRAS Sound Level Calibrator 42AG. For proper sensitivity calibration, we recommend using a pistonphone like GRAS Intelligent Pistonphone 42AP. All GRAS microphones are made of high-quality materials that will ensure life-long stability and robustness. The microphones are all assembled in verified clean-room environments by skilled and dedicated operators with many years of expertise in this field. The microphone diaphragm, body, and improved protection grid are made of high-grade stainless steel, which makes the microphone resistant to physical damage, as well as corrosion caused by aggressive air or gasses. This, combined with the reinforced gold-plated microphone terminal which guarantees a highly reliable connection, enables GRAS to offer 5 years warranty against defective materials and workmanship. Service If you accidentally damage the diaphragm on a GRAS microphone, we can in most cases replace it at a very reasonable cost and with a short turnaround time. This not only protects your investment, but also pleases your quality assurance department because you don't have to worry about new serial numbers, etc. Calibration Before leaving the factory, all GRAS microphones are calibrated in a controlled laboratory environment using traceable calibration equipment. Depending on the use, measurement environment, and internal quality control programs, we recommend recalibrating the microphone at least once a year.

3 Specifications Page: 3 Frequency range (±1 db) Hz 10 to 25 k Frequency range (±2 db) Hz 4 to 70 k Dynamic range lower limit (microphone thermal noise) db(a) 34 Dynamic range lower limit with GRAS preamplifier db(a) 44 Dynamic range upper limit with GRAS +28 V / ±14 V power supply Dynamic range upper limit with GRAS +120 V / ±60 V power supply db 166 db 174 Dynamic range upper limit with GRAS CCP preamplifier db 166 Open-circuit 250 Hz (±3 db) mv/pa 1.6 Open-circuit 250 Hz (±3 db) db re 1V/Pa -56 Resonance frequency khz 50 Microphone cartridge capacitance, typ. pf 7 Microphone venting Front IEC Compliance N/A Temperature range, operation C / F -40 to 120 / -40 to 248 Temperature range, storage C / F -40 to 85 / -40 to 185 Temperature Hz db/ C / db/ F / Static pressure Hz db/kpa Humidity range non condensing % RH 0 to 100 Humidity Hz db/% RH Influence of axial m/s² db re 20 µpa 55 CE/RoHS compliant/weee registered Yes / Yes, Yes Weight g / oz 1.5 / 0.053

4 Specifications Page: 4 Typical frequency response (without protection grid) GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.

5 Dimensions Page: 5

6 We Make Microphones Tradition Since the establishment in 1994, GRAS has been 100% dedicated to developing and manufacturing high-quality measurement microphones and related acoustic equipment. Innovation We work with everybody with an interest in sound or noise within the fields of aerospace, automotive, audiology, consumer electronics, noise monitoring, building acoustics and telecommunications. Quality At GRAS we know that in order for you to trust your measurement results; signal quality, stability and robustness are essentials. We design and build them to perform under real life conditions and beyond. GRAS Sound & Vibration A/S Skovlytoften 33, 2840 Holte, Denmark